Ujt as relaxation oscillator, Electrical Engineering

UJT as relaxation oscillator:

The UJT relaxation oscillator is shown in fig. it consist of a UJT and a capacitor C which is charged through a variable resistance R when VBB is switched ON. R1 and R2 are the external resistances such that R1 << R2, R1 is less than 50. The inclusion of these resistances provides spike waveforms. Here the negative resistance region of the UJT is used. The discharge of the capacitor through UJT develops a saw tooth output as shown in fig. when the circuit is switched on, the capacitor c starts charging through R. during charging period, the voltage across capacitor increases in an exponential relation till it reaches the peak point voltage VB. At this instant of time UJT switches to its slow resistances conducting mode. So, the capacitor small due to small valued of R1 so C discharges abruptly. As the capacitor voltage condenser stars charging again and the next cycle begins.

Posted Date: 2/8/2013 2:57:12 AM | Location : United States







Related Discussions:- Ujt as relaxation oscillator, Assignment Help, Ask Question on Ujt as relaxation oscillator, Get Answer, Expert's Help, Ujt as relaxation oscillator Discussions

Write discussion on Ujt as relaxation oscillator
Your posts are moderated
Related Questions
Q. Explain the significance of the Coupling capacitor and the RE - CE circuit. The function of the coupling capacitor is to isolate the amplifier input circuit from the source.

SPHL Load Stack  pointer with HL Instruction This instruction  copies  the contents of HL register  pair  the stack pointer register. The instruction format is             S

Framework for Indicators in Electricity Sector A framework has been developed and a set of core indicators for electricity Sector has been proposed. In the first example, mapp

a sensorless brushless DC motor control with back emf (zero crossing point ) technique, using Arduino Microcontroller board control and describe in C. program language.

how can I simulate air variable capacitors in cst simulator?

Q. What do you mean by Capacitance? An ideal capacitor is an energy-storage circuit element (with no loss associated with it) representing the electric-field effect. The capaci

the base of isosceles triangle and the altitude drawn from one of the congruent sides are equal to 18cm and 15cm, respectively. Find the lengths of the sides of the triangle.


Q. In the non inverting summing amplifier of Figure, let R d = 1k and M = 6. Find R f so that v =

hi can you help me to create a dc to 3 phase ac circuit which can exceed at any point: 50V and 20A and 400W maximum. The output should be variable from about 0 – 25V per phase, wi